Method for preparing polymer elastic microsphere through precipitation polymerization

The invention relates to a method for preparing a polymer elastic microsphere through precipitation polymerization. According to the method, acetonitrile is taken as a reaction medium, a polyisocyanate compound and polyatomic alcohol or polyamine are taken as monomers, and the polymer elastic microsphere is prepared by introducing a soft segment phase region into a polymer through long-chain polyatomic alcohol or long-chain polyamine. Compared with the prior art, the method is simple, single in raw materials, short in reaction time, high in monomer loading capacity, efficient, energy-saving, low in production cost, and beneficial to realizing of industrial production and application of the microspheres. According to the method, any emulgators or stabilizers are not required, and the obtained microspheres are very clean and can be applied to the field of biological medicine. The obtained polymer microsphere has high elasticity and high monodispersity, and the elasticity and the grain size of the microsphere can be adjusted through the changing of experimental conditions, so that the requirements on the elasticity and the sizes of the microspheres are met on different occasions.